Skiving-machine



H. E. ENSLIN.

SKIVING MACHINE.

APPLICATION FILED MAY 8. 1917.

Patented Nov. 9, 1920.

UNITED STAIEWATENT OFFICE.

HERBERT E. ENSLIN, OF MALDEN, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGN- MEN'IS, '10 UNITED SHOE MAGI-IINERY COPEOR-A'IION, OF PATERSON, NEW JER- SEY, A CORPORATION OF NEW JERSEY. V .r

sKIviNs-MAonmn.

- Application filed May 8,

T 0 all c0 ham it may concern acitizen of the United Eitate's, residing at Maiden, in the county of Middlesex and State of Massachusetts, have invented certain Improvements in Skiving-lilachines, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures. i

This invention relates to skiving machines and is herein illustrated in connection with a machine of .the general type shown in patent to Bayley No. 823,578granted June 19, 1906.

In machines of this type the stock is fed by a feed roll having a substantially horizontal axis and a feed disk having a substantially vertical axis to a rotary disk knife the axis of which is inclined. The margin of the stock is gripped between the lower face of the feed disk and the periphery of the feed roll, being guided in its movement by a stationary edge Between the edge gage and the adjacent point on the periphery ofthe feed disk there is a space the extent of which depends upon the width of the scarf to be produced; and in order to hold the stock down on the feed roll so to produce a smooth, scarf, a presser foot bridges this space, said presser foot being carried at one end of a leaf spring, the other end being fast to a stationary part of the machine. ."With this construction the following disadvantageous result is liable to occur. The edgeof the stock at times crowds up against the edge gage and curls up or over upon itself underneath the presser so that when this curled up or over portion reaches'the knife a gouge is produced in the edge or margin of the stock.

Moreover, when the stock hasonce become pushed against the edge gage and the edge of the stock. curled up; or over in the manner described above, the grip of the feeddisk and feed roll prevents the stock from backing away from the edge. gage and thereby straightening out so as to lie properly in place.

ne feature of the present invention comprises, in a machine of the class described, a knife, an edge gage, a plurality of members constructed and arranged to grip the Specification of Letters Patent.

Patented Nov. 9, 1920.

1917. serial No. 167,331.

stock and feed it to the knife, and means responsive to the curling of the edge of the stock for loosening the grip of the feed members. in the illustrative machine a presser is attached tothe feed disk so that whenever the presser is raised by the curled edg of the stock the feed disk is raised. this action loosen the grip of the disk and roll enough to stop the feeding of the stock or merely loosen it sufliciently to permit the stock to move away fromthe ga e ID until its ed 'e lies flat as it should.

Hitherto the relative positions of the feed disk and feed roll have been such that a vertical plane through the axis of the feed roll either included the axis of the feed disk or was located slightly in the rear of the feed disk axis. Or to state the arrangement of parts in another way, the point on the feed disk, which at any given moment is nearest to the edge gage, isinoving or is about to move away from said gage. The purpose of this arrangement has been to lessen the liability of the edge offhe stock to crowd against the gage and thereby to be curled up or over in the manner which has been described above. This arrangement, however, has the disadvantage that it makes the guiding of the stock through the machine much more diliicult than would be the case were the edge of the stock crowded against the gage continually. Another feature of the present invention comprises in a machine of the class described, a skivingknife, a feed roll, an edge gage, and means for crowding the edge of; the stock against the gage during the feeding movement. 7 l

hese and other features of the invention, including certain details of construction and combinations of parts will be described in 95 connection with an illustrative machine and pointed out in the appended claims. Referring now to the accompanying draw- 1ngs,

Figure l isan elevation of a machine in which the present invention is embodied, and Fig. 2 is a plan of the feed disk, feed roll, edge gage and skiving knife,the knife being shown by a broken line. V

The machine, like that of the patent to Bayl'ey, which has been referred to, comprises a skiving knife 3, a feed disk 5 and a feed roll 7, the knife being driven by a belt 9 and the feed disk and feed roll by means of'worms and gears, an upright shaft and bevel gears as shown. No further description of the details of the driving mechanism will be given since they are the same as those which are shown and described in the patent. present machine the inclination of the knife and the shape of the feed. roll are difi'erent from the showing in the patent. This difference is due merely to the fact that the present machine is'designed to produce a very narrow scarf at an angle of about fortyfive degrees while the machine of the patent is designed to produce the usual scarf'preparatory to folding the margin of a piece of leather.

The edge gage 9 of the machine is formed on one end of an arm 11 the other end of which is integral with a bracket 13 which "is provided with a slot 15 through which the spindle23 of the feed disk 5 and is held from vertical movement with respect to said spindle by a collar 25 fastened to the spindle by a set screw 27, the end. of the arm 21 being held between the collar and an enlargement on the lower endrof the spindle 23. Threaded into a socket in the arm 21 and held in adjusted position by a lock-nut29 is a small post 31 the upper end of which is rotatable in a socket in a block 33 through which the spindle 23 loosely passes. A coiled spring 35 surrounding the stem 23 rests upon the block'33. and bears with its upper end against a part of the frame of the machine. By loosening the lock-nut 29 the post 31 maybe turned to vary the tension of the spring and thereby to vary the force with which the feed disk and presser foot press the stock against the feed roll 7. The end of the edge gage 9 is provided with a vertical groove to receive a tongue 37 (see Fig; 2) on the end of the presser. foot, this connection serving both to guide the presser foot in its vertical movement and to prevent the edge of the stock from riding over the edge gage. With this construction, if the edge of thestock becomes turned up or curled over the presser will be forced to rise and will carry the feed disk with it; and, accord ing to the fixed vertical relation of the presser and disk will either stop the feedj ing of'thestock or .will permit the stock to slip away from the gage so as to allow the turned upfor curled over portion of the edge to assume its proper position. ,In

this connection it should be noted that by changing the position of the collar 25 on the spindle 23 the distance through which 'when the knife becomes worn.

the feed disk is raised by the presser may be varied. a

Referring now to Fig. 2, there is shown the relation of the axis of the feed roll to that of the feed disk. The arrow indicates the direction of rotation of the feed disk; It will be noted that in the" construction and arrangement of parts is and it will be seen that the tendency of the formerly existed for guiding the stock.

The present machine, as has been stated,

is designed to produce a very narrow scarf at a steep angle; and for this work it is desirable to crowd the edge of the work with considerable force against the edge gage. Consequently, in the illustrative machine the axis of thefeed disk is located "(see Fig. 2)

at a considerable'distancebehind a vertical.

plane passed through the axis of the feed roll. It should'be understood, however, that present invention and that the invention in its broader aspects is not limited to the' particular skiving machine or type of skiving machine which has been shown and described. r p v In the illustrative machine the feed roll is adapted to beadjusted toward the knife A certain amount of such adjustment is possible without disturbing essentially the relation of y the axis of the feed roll to that of the feed disk. If, however, it is desired to maintain the relation of the axes exactly as shown, the knife may be made adjustable toward and from the feed roll as, for examplepin the manner set forth in the patent' to Ainazeen No. 273,931 or Bayley No. 479,583' Inasmuch as such adjustment is old and well -known, no showing or description of an illustrative construction, other than this reference to two patents w ll'begiven.

Having thus described my invention, what I claim as new and desire to secure by LettersPatent of the United States is:

l. A machine of the class described, having, in combination, a knife, anedge gage, a plurality of members constructed and arranged to grip the stock and feed it to the knife, and means responsive tothe curling [ofthe edgeof the stock for loosening the grip of the feed members.

2. A machine of the class described, having, in combination, a knife, a plurality of members constructed and arranged to grip the stock and feed it tothe knife, and a presser foot connected to one of said membersin such manner that raising the foot loosens the grip of the members on the stock.

3. A machine of the class described, having, in combination, a knife, a plurality of members constructed and arranged to grip the stock and feed it to the knife, a presser foot connected to one of said members in such manner that raising the foot loosens the grip of the members on the stock, and a spring acting to hold the presser foot and its connected member in contact with the stock.

4. A machine of the class described, having, in combination, a knife, a plurality of members constructed and arranged to grip the stock and feed it to the knife, a presser foot connected to one of said members in such manner that raising the foot loosens the grip of the members on the stock, and means whereby the tension of the spring may be varied.

A machine of the class described, having, in combination, a knife, a feed roll, a feed disk coperating with the roll to feed the stock to the knife, and a presser foot connected to the feed disk in such manner that raising the presser foot raises the feed disk.

6. A machine of the class described, having, in combination, a knife, a feed roll, a feed disk cooperating with the roll to feed the stock to the knife, a presser foot con nected to the feed disk in such manner that raising the presser foot raises the feed disk, and yielding means acting to hold the presser foot and its connected disk in contact with the stock.

7. A machine of the class described, having, in combination, a rotary skiving knife, a rotary feed roll, a vertically yieldable feed disk arranged to cooperate with the roll to feed the stock to the knife, and a presser foot connected to the feed disk in such manner that raising the foot from the roll raises the disk.

8. A machine of the class described, having in combination, a knife, an edge gage, means for feeding the work constructed and ar singed to crowd the edge of the work against the gage, and means responsive to curling of the edge of the Work for controlling the feeding means.

9. A machine of the class described, having, in combination, a skiving knife, a feed roll, an edge gage and a feed disk, rotatable in a plane substantially parallel to the plane of the Work, adapted to cooperate with the roll to feed the stock to the knife and arranged to hold the stock against the gage during the feeding movement.

10. A machine of the class described, having, in combination, a rotary skiving knife, a rotary feed roll, an edge gage located above the feed roll, and a rotary feed disk arranged to rotate in a plane substantially parallel to the plane of the work to cooperate with the roll to feed the stock to the knife, the location of the disk with respect to the gage being such that the point on the disk which is nearest the gage is moving in a direction to crowd the edge of the stock against the gage.

11. A machine of the class described, having, in combination, a skiving knife, a feed roll, a feed disk cooperating with the feed roll to advance the stock to the knife, and an edge gage locatedover the axis of the feed roll, the axis of the disk being located in the rear of a vertical plane containing the axis of the roll.

12. A machine of. the class described, having, in combination, a knife, an edge gage,

a plurality of members constructed and arranged to grip the stock and feed it to the knife, one of said membersacting to hold the edge of the stock firmly against the gage, and means responsive to the curling of the edge of the stock for loosening the grip of the feed members.

13. A machine of the class described, having, in combinatioma knife, an edge gage, a feed roll, means for crowding the edge of the stock against the gage, and means responsive to the curling of the edge of the stock for decreasing the effectiveness of the crowding means.

14. A machine of the class described, having in combination, a knife, an edge gage for guiding the work to the knife, means including a rotary ,disk for feeding the work, yielding means for holding the disk against the work, a presser arranged to bear upon the work close to the edge gage and connecting means between the presser and disk.

In testimony whereof I have signed my name to this specification.

HERBERT n. ENsLiN. 

